Overview

S-Thread thread forming screw - Phillips countersunk Head

Head: JIS 1122B:1988 

Thread: S-Thread standard  

Material:  

Steel, hardened and tempered

Available finishes as specified by BS 7371:  

Zinc + Black  

Zinc + Yellow  

Zinc + Clear (Cr6 free)  

Nickel (Cr6 free)  

Black Nickel (Cr6 free)  

Tolerances unless otherwise stated:

Linear ± 0.1 

Angular ± 2°

Please note: Not all sizes stated are available from stock, please enquire for availability.

Note: Due to the fact that fastening applications differ greatly, the below information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.

Dimension data
Phillips countersunk head as specified by JIS 1122B:1988
Nominal Diameter22.533.544.556
dkBasic size4.5.36.37.38.39.310.312.4
Tolerance0 - 0.40 - 0.50 - 0.60 - 0.7
cAbout020.250.33.4
kBasic size1.21.51.92.22.52.83.13.7
Tolerance0 - 0.20 - 0.30 - 0.4
rMax.0.60.81.01.21.4
mReference2.22.63.64.14.54.95.16.7
qMax.1.011.421.431.932.332.732.933.26
Min.0.651.050.911.41.792.192.382.70

 

Screw materialHardness
SWRCH 18A as specified by JIS3507G:1991ClassificationVickers
Case HardnessHV 450 Min
Case HardnessHV 200 to 400
Nominal pitch sizeCCFFGGYTorsional torqueCase Depth
MinMaxMinMaxMinMaxMaxMaxMinMax
1.4 - 0.31.371.431.311.370.811.011.10---
1.6 - 0.351.571.631.501.560.931.151.25---
1.7 - 0.351.671.731.601.661.051.251.25---
2.0 - 0.401.962.041.881.961.441.581.804.40.040.10
2.6 - 0.452.572.652.482.561.882.052.1012.0
3.0 - 0.502.973.052.872.952.242.442.3018.00.050.18
3.5 - 0.603.483.563.363.442.632.832.7028.0
4.0 - 0.703.994.073.853.933.073.273.2042.00.100.23
5.0 - 0.805.005.084.844.923.874.173.6088.0
6.0 - 1.06.06.105.805.904.444.974.50147.00.150.28
Division of length16 MaxOver 16 to 36 inclusiveOver 36
Tolerance of length0 to -0.80 to -1.20 to -1.6

 

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